wxwidgets issue

[justin...@gmail.com]

Hi all,

I'm relatively new to python and looking at a wxwidgets tutorial. Might I have found a bug?

From a tutorial page linked on the wxpython page we have this:

import wx

app = wx.App(False)

frame = wx.Frame(None, wx.ID_ANY, "Hello World")

frame.Show(True)    

app.MainLoop()

This runs fine from the terminal, but within IEP it will only run once without generating the following traceback:

Traceback (most recent call last):

File "<tmp 1>", line 4, in <module>

frame = wx.Frame(None, wx.ID_ANY, "Hello World")

File "/usr/lib/python2.7/dist-packages/wx-3.0-gtk2/wx/_windows.py", line 580, in __init__

_windows_.Frame_swiginit(self,_windows_.new_Frame(*args, **kwargs))

PyNoAppError: The wx.App object must be created first!

Restarting the shell within IEP allows it to be run again, once per shell instance.

This is Python 2.7.8 on Debian Testing. What silly thing am I doing?

~Justine

[Almar Klein]

Hi Justine,

The error is indeed a bit strange, and I suspect it's a bug in Wx.
However, most GUI toolkits were not designed to get their app created twice.

You could run the file as a script, which would restart the kernel, and
thus provide wx with a clean sheet.

Or, if you enable WX integration in IEP, you can get rid of the creation
of the app and the entering of the mainloop, and you can rerun the code
as often as you want.

Regards,
Almar

On 28-01-15 22:23, justin...@gmail.com wrote:
> Hi all,
>
> I'm relatively new to python and looking at a wxwidgets tutorial. Might
> I have found a bug?
>
> From a tutorial page linked on the wxpython page we have this:
>
> |
>
> importwx
>
>
> app =wx.App(False)
>

> frame =wx.Frame(None,wx.ID_ANY,"Hello World")

>
> frame.Show(True)
>
> app.MainLoop()
>
> |
>
>
> This runs fine from the terminal, but within IEP it will only run once
> without generating the following traceback:
>
> Traceback (most recent call last):
>
> File "<tmp 1>", line 4, in <module>
>
> frame = wx.Frame(None, wx.ID_ANY, "Hello World")
>
> File "/usr/lib/python2.7/dist-packages/wx-3.0-gtk2/wx/_windows.py", line
> 580, in __init__
>
> _windows_.Frame_swiginit(self,_windows_.new_Frame(*args, **kwargs))
>
> PyNoAppError: The wx.App object must be created first!
>
>
> Restarting the shell within IEP allows it to be run again, once per
> shell instance.
>
> This is Python 2.7.8 on Debian Testing. What silly thing am I doing?
>
> ~Justine
>

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[justin...@gmail.com]

Thank you Almar, running as a script does what I need.

>Or, if you enable WX integration in IEP, you can get rid of the creation
of the app and the entering of the mainloop, and you can rerun the code
as often as you want.

I'll have to figure out how to do that, I didn't even know about it.

~Justine

[Almar Klein]

> >Or, if you enable WX integration in IEP, you can get rid of the creation
> of the app and the entering of the mainloop, and you can rerun the code
> as often as you want.
>
> I'll have to figure out how to do that, I didn't even know about it.

Got to shell menu > Shell configurations, and then the "GUI" option.

- Almar